I thought this whole thread was about bodybuilding. That would be the target market for the app that was posted. I claimed that a logbook is useful for bodybuilders.
Originally I thought you were saying that logbooks were bad for bodybuilders, but now I suppose you are saying that bodybuilding in general is a bad activity. That's a whole different debate. Personally I like the appearance of a lean, muscular, and proportional physique, which is what bodybuilding is all about (not that I've attained this yet, but it's a goal).
> They're also slow and have diminished hand speed and explosive power
Bodybuilding won't slow you down, but it's not the optimal way to develop speed, since it develops slow-twitch muscles more than fast-twitch ones.
I don't understand at all your advocating "brief and intense" routines as an alternative to bodybuilding. Most bodybuilding routines are brief and intense sets, with some rest in between.